//****************************************************************//
// This initilaises the dynamic parts of the game to their initial//
// positions as specified by the game level. //
//****************************************************************//
private void InitialiseGameState()
{
////////////////////////////////////////////////////////////
// Place the player at their initial position.
gameState.Player.Position = CLevelUtils.GetPixelFromTileCoordinates(currentLevel.StartPosition);
Random random = new Random();
for (int i = 0; i < currentLevel.EnemyPositions.Count(); i++)
{
////////////////////////////////////////////////////////////
// Place each enemy at their initial position and give them an
// initial random direction.
gameState.Enemies[i].Position = CLevelUtils.GetPixelFromTileCoordinates(currentLevel.EnemyPositions[i]);
gameState.Enemies[i].TargetPosition.X = gameState.Enemies[i].Position.X;
gameState.Enemies[i].TargetPosition.Y = gameState.Enemies[i].Position.Y;
/////////////////////////////////////////////////////////////
// Create a random direction to walk in.
int direction = random.Next() % 4;
switch (direction)
{
case 0:
gameState.Enemies[i].Velocity.X = monster_speed;
gameState.Enemies[i].Velocity.Y = 0.0f;
break;
case 1:
gameState.Enemies[i].Velocity.X = -monster_speed;
gameState.Enemies[i].Velocity.Y = 0.0f;
break;
case 2:
gameState.Enemies[i].Velocity.X = 0.0f;
gameState.Enemies[i].Velocity.Y = monster_speed;
break;
case 3:
default:
gameState.Enemies[i].Velocity.X = 0.0f;
gameState.Enemies[i].Velocity.Y = -monster_speed;
break;
}
}
}
//****************************************************************//
// This function updates the position of each enemy in the game //
// and the player, it then checks if there are collisions between //
// the enemy or the player and raises a PlayerCaught event. //
// It also checks if the player has reached the end goal. //
//****************************************************************//
public void UpdatePositions(CGameState gameState, float time_delta)
{
///////////////////////////////////////////////////////////////////
// First we update the positions of the players and enemies.
foreach (CSprite sprite in gameState.Enemies)
{
UpdatePosition(sprite, time_delta);
}
UpdatePosition(gameState.Player, time_delta);
///////////////////////////////////////////////////////////////////
// Next we check if our player has reached the goal position.
CPoint2f goalPositionPixels = CLevelUtils.GetPixelFromTileCoordinates(m_level.GoalPosition);
if (IsInCollision(gameState.Player.Position, goalPositionPixels))
{
OnGoalReached(this, "You Won!! Goal Reached!!");
return;
}
///////////////////////////////////////////////////////////////////
// Next we check each enemy in turn to see if the user has been
// caught.
foreach (CSprite sprite in gameState.Enemies)
{
if (IsInCollision(gameState.Player.Position, sprite.Position))
{
OnPlayerCaught(this, "You Lose!! Player Caught!!");
break;
}
}
}
//****************************************************************//
// This function is used as an event handler for the load click *//
// event. This is used to load a new level. In addition to *//
// the data required for the level it also ensures the board is *//
// displayed. *//
//****************************************************************//
private void btnLoad_Click(object sender, RoutedEventArgs e)
{
////////////////////////////////////////////////////////////
// clear any existing children from the canvas.
cvsMainScreen.Children.Clear();
///////////////////////////////////////////////////////////
// Get the directory where the level data is stored and
// load the data in.
string fileDir = txtLevelDir.Text;
currentLevel = CLevelParser.ImportLevel(fileDir);
gameTextures = CLevelParser.ImportTextures(fileDir);
///////////////////////////////////////////////////////////
// Draw the set of wall and floor tiles for the current
// level and the goal icon. This is part of the game
// we do not expect to change as it cannot move.
DrawLevel();
//////////////////////////////////////////////////////////
// Add a game state, this represents the position and velocity
// of all the enemies and the player. Basically, anything
// that is dynamic that we expect to move around.
gameState = new CGameState(currentLevel.EnemyPositions.Count());
///////////////////////////////////////////////////////////
// Set up the player to have the correct .bmp and set it to
// its initial starting point. The player's position is stored
// as a tile index on the Clevel class, this must be converted
// to a pixel position on the game state.
playerIcon = new Image();
playerIcon.Width = CGameTextures.TILE_SIZE;
playerIcon.Height = CGameTextures.TILE_SIZE;
playerIcon.Source = gameTextures.PlayerIcon;
cvsMainScreen.Children.Add(playerIcon);
//////////////////////////////////////////////////////////
// Create instances of the enemies and fires for display. We must do
// this as each child on a canvas must be a distinct object,
// we could not simply add the same image multiple times.
enemyIcons = new Image[currentLevel.EnemyPositions.Count()];
for (int i = 0; i < currentLevel.EnemyPositions.Count(); i++)
{
enemyIcons[i] = new Image();
enemyIcons[i].Width = CGameTextures.TILE_SIZE;
enemyIcons[i].Height = CGameTextures.TILE_SIZE;
enemyIcons[i].Source = gameTextures.EnemyIcon;
cvsMainScreen.Children.Add(enemyIcons[i]);
}
fireIcons = new Image[currentLevel.FirePositions.Count()];
for (int i = 0; i < currentLevel.FirePositions.Count(); i++)
{
fireIcons[i] = new Image();
fireIcons[i].Width = CGameTextures.TILE_SIZE;
fireIcons[i].Height = CGameTextures.TILE_SIZE;
fireIcons[i].Source = gameTextures.FireIcon;
cvsMainScreen.Children.Add(fireIcons[i]);
CPoint2i tilePosition = CLevelUtils.GetPixelFromTileCoordinates(new CPoint2i(currentLevel.FirePositions[i].X, currentLevel.FirePositions[i].Y));
Canvas.SetLeft(fireIcons[i], tilePosition.X);
Canvas.SetTop(fireIcons[i], tilePosition.Y);
}
loadTextures();
////////////////////////////////////////////////////////////
// Set each instance of a dynamic object to its initial position
// as defined by the current level object.
InitialiseGameState();
////////////////////////////////////////////////////////////
// Render the current game state, this will render the player
// and the enemies in their initial position.
RenderGameState();
}
//****************************************************************//
// This function draws the static parts of the level onto the *//
// canvas. *//
//****************************************************************//
private void DrawLevel()
{
/////////////////////////////////////////////////////////////
// Compute the width of the canvas, this will be the number
// of tiles multiplied by the tile size (in pixels).
int width = currentLevel.Width * CGameTextures.TILE_SIZE;
int height = currentLevel.Height * CGameTextures.TILE_SIZE;
cvsMainScreen.Width = width;
cvsMainScreen.Height = height;
/////////////////////////////////////////////////////////////
// Loop through the level setting each tiled position on the
// canvas.
for (int y = 0; y < currentLevel.Height; y++)
{
for (int x = 0; x < currentLevel.Width; x++)
{
/////////////////////////////////////////////////////////
// We must create a new instance of the image as an image
// can only be added once to a given canvas.
Image texture = new Image();
texture.Width = CGameTextures.TILE_SIZE;
texture.Height = CGameTextures.TILE_SIZE;
//////////////////////////////////////////////////////////
// Set the position of the tile, we must convert from tile
// coordinates to pixel coordinates.
CPoint2i tilePosition = CLevelUtils.GetPixelFromTileCoordinates(new CPoint2i(x, y));
Canvas.SetLeft(texture, tilePosition.X);
Canvas.SetTop(texture, tilePosition.Y);
//////////////////////////////////////////////////////////
// Check whether it should be a wall tile or floor tile.
if (currentLevel.GetTileType(x, y) == eTileType.Wall)
{
texture.Source = gameTextures.WallTexture;
}
else
{
texture.Source = gameTextures.FloorTexture;
}
cvsMainScreen.Children.Add(texture);
}
}
////////////////////////////////////////////////////////////
// The goal is also static as it does not move so we will
// also add this now also.
Image goalImg = new Image();
goalImg.Width = CGameTextures.TILE_SIZE;
goalImg.Height = CGameTextures.TILE_SIZE;
goalImg.Source = gameTextures.GoalIcon;
CPoint2i GoalPosition = CLevelUtils.GetPixelFromTileCoordinates(new CPoint2i(currentLevel.GoalPosition.X, currentLevel.GoalPosition.Y));
Canvas.SetLeft(goalImg, GoalPosition.X);
Canvas.SetTop(goalImg, GoalPosition.Y);
cvsMainScreen.Children.Add(goalImg);
}